I should have said I think both longer *and* shorter works will become more available. I know several people that write short stories but basically do it 'for fun' because it's hard to get them published. I'm sure there are many authors in the same position. Now they can published their stories themselves.
With ebooks, authors are no longer constrained by artificial word-count limits based on what size books publishers felt they could make the most money on. Why can't a historical novel be 60,000 words long? Or a romance be 150,000 words long?
I'm sure we've all read posts here at AW from authors who've written a book that ended up being outside the recommended guidelines for their genre. But why are we (authors) letting publishers decide what is 'too long' or 'too short'? The story itself should determine the length. Some stories are meant to be 10,000 words long (or 100,000 or whatever). Deliberately padding or cutting stories just to fit arbitrarily defined limits is silly, yet many of us here have fallen into that trap.
(Of course, this is all based on the assumption that the story is 'good'. I've read many books that felt 'bloated' to me and I've also read many books that I wished had been longer.)